What was the original failed experiment that eventually led to the invention of Post-it Notes at 3M?

Some of the world's most iconic products were born from unexpected discoveries or accidents in the lab. The journey from scientific experiment to market-dominating product often involves creative product design, smart branding decisions, and innovative marketing campaigns. Test your knowledge about one of the most famous 'accidental' office products that revolutionized how we organize information.

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An attempt to create a super-strong adhesive that permanently bonded surfaces
A test to develop heat-resistant paper for aerospace applications
Research into developing water-soluble glues for children's crafts
An experiment to create invisible ink for secure document handling